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RAID 0 + 1 Controller Help

post #1 of 8
Thread Starter 
What’s up all,

I am doing a new build (dual water cooled loops) on a ASUS crosshair IV formula with a AMD P6 1100T and dual 6970’s, I plan on using a SATA III SSD 64Gig for a boot drive connected to the MB, and then 4X 500 or 750Gig SATA II WD Black hard drives in a RAID 0 + 1 for gaming, video editing, etc, etc…

I do not want to consume so many CPU cycles by using the motherboard’s SATA connections and building the array there, ( I have read that using the motherboard can consume about 5-7% of CPU cycles) so I was looking for a good SATA II RAID controller that is not to costly, I can water cool if needed so I am worried about heat…


Would appreciate any and all feedback…

Thanks,
    
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post #2 of 8
For RAID 0+1 (or better yet RAID 10), using the motherboard SATA controller is fine. Those RAID levels, along with RAID 0 and RAID 1, don't really consume CPU cycles, since they are not calculating parity (like with RAID 5).

If you still want to get one, just get an el cheapo SIL-based controller off eBay. A PCIe-based one will run to around $35, based on £->$ exchange rate.

Oh by the way, the only RAID controller that ever needed water cooling was the Dell PERC 5/i.
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post #3 of 8
Quote:
Originally Posted by parityboy View Post
For RAID 0+1 (or better yet RAID 10), using the motherboard SATA controller is fine. Those RAID levels, along with RAID 0 and RAID 1, don't really consume CPU cycles, since they are not calculating parity (like with RAID 5).
This.

Quote:
Originally Posted by parityboy View Post
If you still want to get one, just get an el cheapo SIL-based controller off eBay. A PCIe-based one will run to around $35, based on £->$ exchange rate.
All cheap controllers use the CPU in exactly the same way as the onboard controllers do - so they won't save you any cycles at all. You will also find that most of the cheaper controllers will bottleneck your drives, as many can't get much above 120MB/s or so even in RAID0/10.
post #4 of 8
Thread Starter 
Quote:
Originally Posted by parityboy View Post
For RAID 0+1 (or better yet RAID 10), using the motherboard SATA controller is fine. Those RAID levels, along with RAID 0 and RAID 1, don't really consume CPU cycles, since they are not calculating parity (like with RAID 5).

If you still want to get one, just get an el cheapo SIL-based controller off eBay. A PCIe-based one will run to around $35, based on £->$ exchange rate.

Oh by the way, the only RAID controller that ever needed water cooling was the Dell PERC 5/i.

Thanks, I know it's called RAID 10, but I call it 0+1, as that is really what it is, 2 arrays the first being RAID 0 and the second being a RAID 1, nested together correct ???

I am looking to offload my CPU as much as possible and let hardware on the I/O bus use some free bandwidth...

Please take a look at the link as you would know better than I if what I am reading from this is correct, please look under "Performance:" and "Overheads (CPU, RAM etc):" I read it that a nested array does have a impact on CPU cycles and this is what I am trying to aviod if possible without buying a high end conntroller...

Link = http://www.cyberciti.biz/tips/raid-h...-software.html

Let me know what you think and if it is worth getting 4 SATA II drives for a RAID 10 setup and connecting them to motherboard which has SATA III (I know there are backward compatible) connections or if you know of a good card (was hoping to find one with a real RAID controller on it and some memory for read-backs) Please let me know...

Bottom line I am looking for speed first and than protection of my data, and I am aware that a spinning platter will never reach the max of a SATA II let alone a SATA III connection so I am try to see what I can do with 4 drives to achive the best of both without using to many CPU cycles...

What would either of you do in my shoes ???


Thanks parityboy and the_beast... You feedback is very welcomed
    
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post #5 of 8
RAID10 and RAID0+1 are not the same - and RAID10 is the one you want. No time now but I'll go into why later if no-one chips in.

You will not notice the loss of cpu cycles at all. You're more likely to have lower performance with a cheap card than the onboard, and a full caching controller won't net any benefit either. Not read your article yet but I suspect it is out of date - cpu cycles for RAID were an issue when the Pentium II was common, but it really is of no concern nowadays, especially with non-parity RAID.
post #6 of 8
Quote:
Originally Posted by Sync_Bit View Post
Thanks, I know it's called RAID 10, but I call it 0+1, as that is really what it is, 2 arrays the first being RAID 0 and the second being a RAID 1, nested together correct ???
Nope not correct there are drawing on the internet that show what you are saying but are not correct about how its really done.

And if you must call RAID 10 something else call it 1+0 as their really is another RAID type called 0+1.

In a four disk RAID 10 setup there are two RAID 1 arrays that are then RAID 0 across.
In a four disk RAID 0+1 setup there are two RAID 0 arrays that are then RAID 1 across.
Edited by PeterUK - 1/20/11 at 12:59am
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post #7 of 8
@OP:

For the best combination of speed & redundancy, RAID 10 is indeed your best bet. Additionally, that link you posted does not tell the whole story - CPU performance is only of concern when dealing with parity-based RAID levels. For what you're intending it's irrelevant.
Edited by parityboy - 1/20/11 at 11:23am
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post #8 of 8
Thread Starter 
OK RAID 10 it is and I will go with this, thanks to all for the information...
    
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